2016MNRAS.458.2161L

Query : 2016MNRAS.458.2161L

2016MNRAS.458.2161L - Mon. Not. R. Astron. Soc., 458, 2161-2187 (2016/May-2)

From spin noise to systematics: stochastic processes in the first International Pulsar Timing Array data release.

LENTATI L., SHANNON R.M., COLES W.A., VERBIEST J.P.W., VAN HAASTEREN R., ELLIS J.A., CABALLERO R.N., MANCHESTER R.N., ARZOUMANIAN Z., BABAK S., BASSA C.G., BHAT N.D.R., BREM P., BURGAY M., BURKE-SPOLAOR S., CHAMPION D., CHATTERJEE S., COGNARD I., CORDES J.M., DAI S., DEMOREST P., DESVIGNES G., DOLCH T., FERDMAN R.D., FONSECA E., GAIR J.R., GONZALEZ M.E., GRAIKOU E., GUILLEMOT L., HESSELS J.W.T., HOBBS G., JANSSEN G.H., JONES G., KARUPPUSAMY R., KEITH M., KERR M., KRAMER M., LAM M.T., LASKY P.D., LASSUS A., LAZARUS P., LAZIO T.J.W., LEE K.J., LEVIN L., LIU K., LYNCH R.S., MADISON D.R., McKEE J., McLAUGHLIN M., McWILLIAMS S.T., MINGARELLI C.M.F., NICE D.J., OSLOWSKI S., PENNUCCI T.T., PERERA B.B.P., PERRODIN D., PETITEAU A., POSSENTI A., RANSOM S.M., REARDON D., ROSADO P.A., SANIDAS S.A., SESANA A., SHAIFULLAH G., SIEMENS X., SMITS R., STAIRS I., STAPPERS B., STINEBRING D.R., STOVALL K., SWIGGUM J., TAYLOR S.R., THEUREAU G., TIBURZI C., TOOMEY L., VALLISNERI M., VAN STRATEN W., VECCHIO A., WANG J.-B., WANG Y., YOU X.P., ZHU W.W. and ZHU X.-J.

Abstract (from CDS):

We analyse the stochastic properties of the 49 pulsars that comprise the first International Pulsar Timing Array (IPTA) data release. We use Bayesian methodology, performing model selection to determine the optimal description of the stochastic signals present in each pulsar. In addition to spin-noise and dispersion-measure (DM) variations, these models can include timing noise unique to a single observing system, or frequency band. We show the improved radio-frequency coverage and presence of overlapping data from different observing systems in the IPTA data set enables us to separate both system and band-dependent effects with much greater efficacy than in the individual pulsar timing array (PTA) data sets. For example, we show that PSR J1643-1224 has, in addition to DM variations, significant band-dependent noise that is coherent between PTAs which we interpret as coming from time-variable scattering or refraction in the ionized interstellar medium. Failing to model these different contributions appropriately can dramatically alter the astrophysical interpretation of the stochastic signals observed in the residuals. In some cases, the spectral exponent of the spin-noise signal can vary from 1.6 to 4 depending upon the model, which has direct implications for the long-term sensitivity of the pulsar to a stochastic gravitational-wave (GW) background. By using a more appropriate model, however, we can greatly improve a pulsar's sensitivity to GWs. For example, including system and band-dependent signals in the PSR J0437-4715 data set improves the upper limit on a fiducial GW background by ∼60 per cent compared to a model that includes DM variations and spin-noise only.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): methods: data analysis - pulsars: general

CDS comments: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Simbad objects: 49

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Number of rows : 49
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PSR J0030+0451 Psr 00 30 27.42348 +04 51 39.7144           ~ 596 1
2 PSR J0034-05 Psr 00 34 21.8281 -05 34 36.620           ~ 201 0
3 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 365 2
4 PSR J0437-47 Psr 04 37 15.7994581776 -47 15 08.544351636           DC 1032 0
5 PSR J0610-2100 Psr 06 10 13.602953 -21 00 27.74435           ~ 116 0
6 PSR B0613-02.0 Psr 06 13 43.977070 -02 00 47.34294           ~ 319 1
7 PSR J0621+10 Psr 06 21 22.11108 +10 02 38.7410           ~ 128 1
8 PSR J0712-68 Psr 07 11 54.153093 -68 30 47.23387           ~ 120 1
9 PSR J0751+1807 Psr 07 51 09.1539 +18 07 38.335           ~ 316 1
10 PSR J0900-3144 Psr 09 00 43.95220 -31 44 30.8722           ~ 68 0
11 PSR J1012+5307 Psr 10 12 33.4345449600 +53 07 02.548542576     19.5     DA 419 1
12 PSR J1022+10 Psr 10 22 57.990 +10 01 52.92           ~ 279 2
13 PSR J1025-07 Psr 10 24 38.6991893112 -07 19 19.045523388     19.81 18.78 18.00 ~ 286 1
14 PSR J1045-45 Psr 10 45 50.179671 -45 09 54.05686           ~ 154 1
15 PSR J1455-3300 Psr 14 55 47.976991 -33 30 46.40280           ~ 165 1
16 PSR J1600-3053 Psr 16 00 51.902514 -30 53 49.45343           ~ 218 0
17 PSR J1604-72 Psr 16 03 35.670781 -72 02 32.82328           ~ 142 0
18 PSR J1640+2224 Psr 16 40 16.744850 +22 24 08.84119           ~ 210 0
19 PSR J1643-1224 Psr 16 43 38.16612 -12 24 58.6334           ~ 260 2
20 PSR J1713+0747 Psr 17 13 49.5367813 +07 47 37.450240           ~ 530 1
21 PSR J1721-2457 Psr 17 21 05.50008 -24 57 06.2260           ~ 37 0
22 PSR J1730-2304 Psr 17 30 21.68471 -23 04 31.2590           ~ 194 1
23 PSR J1732-5049 Psr 17 32 47.766068 -50 49 00.31465           ~ 87 0
24 PSR J1738+0333 Psr 17 38 53.966386 +03 33 10.87200           ~ 191 1
25 PSR J1744-1134 Psr 17 44 29.4220844 -11 34 54.801320           ~ 323 1
26 PSR J1751-2857 Psr 17 51 32.686848 -28 57 46.57130           ~ 65 1
27 PSR J1801-1417 Psr 18 01 51.064902 -14 17 34.54980           ~ 45 0
28 PSR J1802-2124 Psr 18 02 05.334393 -21 24 03.67600           ~ 101 1
29 PSR J1804-27 Psr 18 04 21.13307 -27 17 31.3370           ~ 87 1
30 PSR J1824-2452A Psr 18 24 32.009 -24 52 11.10           ~ 529 2
31 PSR J1843-1113 Psr 18 43 41.260405 -11 13 31.10310           ~ 86 0
32 PSR J1853+1303 Psr 18 53 57.3183 +13 03 44.088           ~ 107 1
33 PSR B1855+09 Psr 18 57 36.390620 +09 43 17.20712           DA 569 1
34 PSR J1909-3744 Psr 19 09 47.42820 -37 44 14.7740           ~ 343 2
35 PSR J1910+1256 Psr 19 10 09.701454 +12 56 25.48680           ~ 108 1
36 PSR J1911-11 Psr 19 11 49.2927 -11 14 22.330           ~ 87 1
37 PSR J1911+1347 Psr 19 11 55.204694 +13 47 34.38383           ~ 72 0
38 PSR J1918-0642 Psr 19 18 48.027685 -06 42 34.95735           ~ 146 0
39 PSR B1937+21.4 Psr 19 39 38.560096 +21 34 59.13552           ~ 1142 0
40 PSR B1953+29 Psr 19 55 27.8680959374 +29 08 43.499227152           ~ 303 1
41 PSR J2010-1323 Psr 20 10 45.922635 -13 23 56.13270           ~ 93 0
42 PSR J2019+24 Psr 20 19 31.94900 +24 25 15.3038           ~ 145 1
43 PSR J2033+1736 Psr 20 33 16.9140266736 +17 37 48.047177388   11.59 10.50     ~ 76 0
44 PSR J2124-3358 Psr 21 24 43.834930 -33 58 45.49195           ~ 337 1
45 PSR J2129-5718 Psr 21 29 22.781548 -57 21 14.33356           ~ 122 1
46 PSR B2145-07.8 Psr 21 45 50.45590 -07 50 18.5900           ~ 336 0
47 PSR J2229+26 Psr 22 29 50.883815 +26 43 57.61393           ~ 121 1
48 PSR J2317+1439 Psr 23 17 09.235606 +14 39 31.29559           ~ 211 1
49 PSR J2322+2057 Psr 23 22 22.320041 +20 57 02.50080           ~ 129 1

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